Enhanced biodegradation of atrazine by bacteria encapsulated in organically modified silica gels.

Citation data:

Journal of colloid and interface science, ISSN: 1095-7103, Vol: 510, Page: 57-68

Publication Year:
2018
Usage 5
Abstract Views 5
Social Media 2
Tweets 2
PMID:
28934611
DOI:
10.1016/j.jcis.2017.09.044
Author(s):
Benson, Joey J, Sakkos, Jonathan K, Radian, Adi, Wackett, Lawrence P, Aksan, Alptekin
Publisher(s):
Elsevier BV
Tags:
Materials Science, Chemical Engineering
Most Recent Tweet View All Tweets
article description
Biodegradation by cells encapsulated in silica gel is an economical and environmentally friendly method for the removal of toxic chemicals from the environment. In this work, recombinant E. coli expressing atrazine chlorohydrolase (AtzA) were encapsulated in organically modified silica (ORMOSIL) gels composed of TEOS, silica nanoparticles (SNPs), and either phenyltriethoxysilane (PTES) or methyltriethoxysilane (MTES). ORMOSIL gels adsorbed much higher amounts of atrazine than the hydrophilic TEOS gels. The highest amount of atrazine adsorbed by ORMOSIL gels was 48.91×10μmol/mlgel, compared to 8.71×10μmol/mlgel by the hydrophilic TEOS gels. Atrazine biodegradation rates were also higher in ORMOSIL gels than the TEOS gels, mainly due to co-localization of the hydrophobic substrate at high concentrations in close proximity of the encapsulated bacteria. A direct correlation between atrazine adsorption and biodegradation was observed unless biodegradation decreased due to severe phase separation. The optimized PTES and MTES gels had atrazine biodegradation rates of 0.041±0.003 and 0.047±0.004μmol/mlgel, respectively. These rates were approximately 80% higher than that measured in the TEOS gel. This study showed for the first time that optimized hydrophobic gel material design can be used to enhance both removal and biodegradation of hydrophobic chemicals.

This article has 0 Wikipedia mention.